\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Electoral System, Candidate Communication, and Change in Partisan Affect (Feeling Thermometer)\label{tab:apftcon}}
\begin{tabular}{l*{3}{c}}
\hline\hline
                &\multicolumn{1}{c}{(1)}   &\multicolumn{1}{c}{(2)}   &\multicolumn{1}{c}{(3)}   \\
                &Affective Polarization   & In-Group   &Out-Group   \\
                &     b/se   &     b/se   &     b/se   \\
\hline
RCV Compliment  &   -0.008*  &   -0.011*  &    0.005   \\
                &  (0.004)   &  (0.005)   &  (0.005)   \\
RCV Comp. + Endorse&   -0.009*  &   -0.010   &    0.009   \\
                &  (0.004)   &  (0.005)   &  (0.005)   \\
Age             &    0.000*  &    0.000   &   -0.000*  \\
                &  (0.000)   &  (0.000)   &  (0.000)   \\
Female          &   -0.003   &   -0.002   &    0.005   \\
                &  (0.003)   &  (0.004)   &  (0.004)   \\
Education       &   -0.000   &    0.001   &    0.001   \\
                &  (0.001)   &  (0.002)   &  (0.002)   \\
White           &   -0.002   &   -0.005   &   -0.001   \\
                &  (0.004)   &  (0.005)   &  (0.005)   \\
Liberal         &    0.019*  &    0.019*  &   -0.020*  \\
                &  (0.007)   &  (0.010)   &  (0.010)   \\
Moderate        &   -0.037*  &   -0.029   &    0.046*  \\
                &  (0.015)   &  (0.019)   &  (0.019)   \\
Demcorat        &   -0.004   &   -0.025   &   -0.016   \\
                &  (0.012)   &  (0.015)   &  (0.015)   \\
Republican      &    0.010   &   -0.007   &   -0.027   \\
                &  (0.012)   &  (0.016)   &  (0.016)   \\
Constant        &   -0.020   &    0.008   &    0.048** \\
                &  (0.014)   &  (0.018)   &  (0.018)   \\
\hline
R$^2$           &     0.01   &     0.01   &     0.01   \\
\textit{N}      &     2250   &     2250   &     2250   \\
\hline\hline
\end{tabular}
\end{table}
